Nord-Trøndelag was a county constituting the northern part of the present-day Trøndelag county in Norway. It bordered the old Sør-Trøndelag county as well as the county of Nordland. To the west is the Norwegian Sea, and to the east is Jämtland in Sweden. The county was established in 1804 when the old Trondhjems amt was divided into two: Nordre Trondhjems amt and Søndre Trondhjems amt. In 2016, the two county councils voted to merge (back) into a single county on 1 January 2018.

The Nordland Line is a 729-kilometer (453 mi) railway line between Trondheim and Bodø, Norway. It is the longest in Norway and lacks electrification. The route runs through the counties of Trøndelag and Nordland, carrying a combination of commuter, long-haul passenger and freight trains. From Trondheim Central Station to Steinkjer Station the line is most heavily used, with hourly services by the Trøndelag Commuter Rail. There are three branch lines—the Stavne–Leangen Line at Leangen Station, the Meråker Line at Hell Station and the Namsos Line at Grong Station.